Articles you may be interested inProtocol for measuring permeability and form coefficient of porous media Phys. Fluids 17, 088101 (2005); 10.1063/1.1979307 Probing porous media with first and second sound. II. Acoustic properties of watersaturated porous media Probing porous media with 1st sound, 2nd sound, 4th sound, and 3rd sound AIP Conf.The acoustic properties of first and second sound in He II are used to probe the dynamic permeability k(o), of porous media whose pores are large enough that the bulk properties of "He are relevant. The measurements of phase velocity and attenuation, considered as functions of frequency and temperature, are in excellent agreement with the predictions based on a model k(o) which involves four parameters: (b (porosity), C-Z~ (tortuosity), ka (dc permeability), and A (dynamically connected pore size). The first three of these are measured by independent means; accurate values of h are extracted directly from the measurements in the high-frequency region of the data where the observed temperature and frequency dependences of the modes are precisely those predicted on theoretical grounds. ,It is shown empirically that A is in fact closely related to the dc permeability ka for all known data sets, thus supporting 'an earlier conjecture based on theoretical ideas. 104

Dedicated to our mentor, Joel L. Lebowitz, a master of statistical physics who, when it came to foundational issues of quantum mechanics, was always willing to listen. AbstractWe discuss proofs of nonlocality based on a generalization by Erwin Schrödinger of the argument of Einstein, Podolsky and Rosen. These proofs do not appeal in any way to Bell's inequalities. Indeed, one striking feature of the proofs is that they can be used to establish nonlocality solely on the basis of suitably robust perfect correlations. First we explain that Schrödinger's argument shows that locality and the perfect correlations between measurements of observables on spatially separated systems implies the existence of a non-contextual value-map for quantum observables; non-contextual means that the observable has a particular value before its measurement, for any given quantum system, and that any experiment "measuring this observable" will reveal that value. Then, we establish the impossibility of a non-contextual value-map for quantum observables without invoking any further quantum predictions. Combining this with Schrödinger's argument implies nonlocality. Finally, we illustrate how Bohmian mechanics is compatible with the impossibility of a non-contextual value-map.

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Fundamental issues in pre aring high quality high T YBa&u,O thin films are adgessed. The techniques of inverted q%idrical magnetron sputtering and pulsed laser deposition are chosen as successful examples to illustrate how the key problems can be solved. The fabrication of YBa2(3l,O,$PrBa;?Cu307-su erlattices where superconductivity in a singfe unit celrlayer of YB Cu30 -x was observed demonstrates the state of the art of%in fi6n deposition of high T, materials. Systematic variations of the deposition parameters result in changes of superconducting and structural properties of the films that correlate with their microwave and infrared characteristics.

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